What if the best smartphone companion was the TV?It must be admitted: as a family or on the occasion of an evening with friends, it is more comfortable to look on the big screen the photos and videos stored on a small mobile.With its Chromecast Wi-Fi adapter which plugs into the HDMI connector of any TV, Google provides a simple response to this situation.Choose on your smartphone a YouTube video or a movie bought on Google Play and you can broadcast it, wireless, on TV.Without being revolutionary, this solution confirms that the television is increasingly imposed as the display device par excellence of smartphones and tablets.A field in which several technologies compete, each being linked to a particular type of equipment.

● The Google solution, for smartphones users, rather Android

Material: the Chromecast Wi-Fi key and any Android and iOS mobile or a mac or windows computer.

The principle: connect the small key to an HDMI connector from your TV, connect it to the Wi-Fi network of your home and you can broadcast on the big screen various content chosen on your mobile by pressing the adequate icon.

In practice: you must install the Chromecast application on the mobile to transfer the display of YouTube videos and films and music purchased or rented on Google Play.Other apps are compatible, such as Canalplay (VOD)), Pluzz (catch -up television of the France Télévisions group)) and SFR TV, or even apps that allow you to broadcast on the TV movies and photos contained on the mobile.

The price: 35 € for the chromecast key.

We like: ease of use, the possibility of continuing to use mobile during the diffusion of content.

We like less: the small number of compatible applications, which reduces the interest of the product compared to the connected services that we obtain on an ADSL box.

● The Apple solution for Apple products users

Material: iPhone, iPad, MacBook Pro, Appletv, Freebox.

The principle: on your iPhone or iPad, press the triangle icon to immediately transfer the broadcast of a photo or video on your TV.

In practice: Airplay compatible receiver is needed, such as the Apple Freebox Revolution or Apple TV that plugs between the TV and the ADSL box.You can directly transfer videos contained on the mobile or broadcast on the internet and reply the display of a computer on the TV.There are applications for Windows, like Airparrot, which allow you to transmit photos and videos without pc wirelessly.

The price: € 109 for the Apple TV.

We like: the impeccable simplicity of the system, the centralized VOD on iTunes which allows you to enjoy films on several devices.

We like it less: limitation in terms of video formats.

● The Miracast solution, for users of Android smartphones

Material: Android smartphone equipped with a compatible Wi-Fi chip, such as the Samsung Galaxy S4, the Sony Xperia or the Nexus 5, and Miracast receiver or compatible TV.

The principle: Once the smartphone has been connected to the miracast receiver, the TV displays the mobile screen.

In practice: we connect the miracast adapter to the television and connect the mobile to the Wi-Fi network it created, without going through the house.The applications, videos and photos displayed on the smartphone then appear on the TV as if it were his screen.Latence time, however, limits the interest of the system for games.For videos, the display is often transmitted in 720p.

The price: from € 30 for the Miracast receiver but some televisions (LG, Panasonic or Sony)) offer this standard technology.

We like: the system works even if we don't have Adsl boxes.

We like it less: the unfinished aspect of technology, display problems and loss of connection, direct Wi-Fi connectivity that prevents the smartphone from accessing the Internet.

● The DLNA solution, for users of Android, Windows Phone and Blackberry mobile users

Material: any DLNA compatible device (recent TV, Internet box, game console, network drive, computer, tablet or smartphone, wireless speaker, Blu-ray player, Home-Cinema amplifier, etc..)).

The principle: once connected to the same Wi-Fi network, DLNA devices are recognized automatically and can communicate with each other, which allows for example to display, on the screen of a TV, a video stored on a tablet,A computer or a network disk.

In practice: most Android mobiles, Windows Phone and BlackBerry have the DLNA function as standard.At Samsung, technology has been renamed Allshare.To display on a DLNA TV videos of an iPhone and iPad, you have to download an app like Air Playit, Air Video Free or Arkmc Lite DLNA.Computers must also have adequate software, such as Serviio, Ps3 Media Server or XBMC.

The price: free in most cases, some apps may be paid.

We like: standardization and opening of the system, which allows you to read almost any multimedia file with a large number of devices

We like it less: depending on the quality of the network, reading a video can be jerky.